US4273697A - Electrically conductive curable liquid organopolysiloxane compositions - Google Patents

Electrically conductive curable liquid organopolysiloxane compositions Download PDF

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Publication number
US4273697A
US4273697A US06/122,782 US12278280A US4273697A US 4273697 A US4273697 A US 4273697A US 12278280 A US12278280 A US 12278280A US 4273697 A US4273697 A US 4273697A
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composition
polyorganosiloxane
parts
composition according
linking agent
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US06/122,782
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Shinichi Sumimura
Koji Shimuzu
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DuPont Toray Specialty Materials KK
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Toray Silicone Co Ltd
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Assigned to TORAY SILICONE COMPANY, LTD. reassignment TORAY SILICONE COMPANY, LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SHIMUZU KOJI, SUMIMURA SHINICHI
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic

Definitions

  • the present invention relates to a curable liquid organopolysiloxane composition which produces a cured product having excellent electrical conductivity.
  • compositions are known in which an organopolysiloxane is compounded with a conductive material such as carbon black, graphite and carbon fiber in order to impart electrical conductivity to silicone rubber.
  • a conductive material such as carbon black, graphite and carbon fiber
  • the desired electrical conductivity cannot be obtained unless a large quantity of conductive material, such as carbon black or graphite, is present in the composition.
  • the flowability significantly decreases when a large quantity of conductive material is present causing difficulty in mixing and molding.
  • carbon fiber is very expensive, the cost of production is increased.
  • the surface smoothness of silicone rubber is affected when carbon fiber with a certain length is used.
  • this invention proposes a curable liquid organopolysiloxane composition which can form a cured product having good electrical conductivity using an extremely small amount of certain carbon black compared to the amount of carbon black used in the conventional compositions and also having excellent physical properties such as tensile strength and elongation.
  • the carbon black used in the present invention has a specific surface area of at least 900 m 2 /g and has hollow-shell-shaped particles.
  • This invention relates to a curable a liquid composition
  • a curable a liquid composition comprising (A) 100 parts by weight of a curable liquid organopolysiloxane comprising a liquid polyorganosiloxane and a cross-linking agent, (B) 0.1-70 parts by weight of carbon black whose specific surface is at least 900 m 2 /g and which are hollow-shell-shaped particles, and (C) 0-50 parts by weight of a hydroxyl endblocked polydiorganosiloxane whose degree of polymerization is 50 or less.
  • the curable liquid organopolysiloxane, component (A) used in this invention is a mixture of a liquid polyorganosiloxane and a cross-linking agent.
  • a curing mechanism those of a radical reaction type using the conventional known organic peroxides, those of a condensation reaction type and those of an addition reaction type are all included.
  • the liquid polyorganosiloxane can be expressed by siloxane units which are bonded together by Si-O-Si bonds and which can be expressed by a general unit formula ##EQU1## in which each R represents a substituted or unsubstituted monovalent hydrocarbon radical such as methyl, ethyl, propyl, octyl, phenyl, vinyl or trifluoropropyl and in each siloxane unit a is an integer from 1 to 3 inclusive.
  • each R represents a substituted or unsubstituted monovalent hydrocarbon radical such as methyl, ethyl, propyl, octyl, phenyl, vinyl or trifluoropropyl
  • each siloxane unit a is an integer from 1 to 3 inclusive.
  • the polyorganosiloxane is in a liquid form at room temperature, its molecular structure can be a straight chain, a branched chain, a network structure or a slightly three-dimensional structure.
  • This polyorganosiloxane can be a homopolymer or copolymer or mixture of two or more types of polymers.
  • the viscosity is not particularly critical as long as the polyorganosiloxane is in a liquid state at room temperature. However, the viscosity at 25° C. preferably ranges from 0.0001 to 0.1 m 2 /s for best workability.
  • the liquid polyorganosiloxane used in the radical reaction using an organic peroxide preferably contains vinyl radicals bonded to silicon atoms either at the polymer ends or along the polymer chain.
  • the organic peroxides which are used as cross-linking agents are those commonly known as cross-linking agents for silicone rubber. Examples of these organic peroxides are as follows: benzoyl peroxide, dicumyl peroxide, di-tert-butyl peroxide, tert-butyl perbenzoate, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.
  • the liquid polyorganosiloxane used in the condensation reaction is polyorganosiloxane containing silicon-bonded hydroxyl groups at the ends of the polymer molecules.
  • the cross-linking agent for the condensation reaction can be a functional compound selected from silanes, their partial hydrolysis--condensation products, cyclic polyorganosiloxanes, straight chain polyorganosiloxanes and mixtures thereof wherein each silane or siloxane has at least two functional groups per molecule which are bonded to silicon atoms and which are hydrolyzable with moisture.
  • the functional groups are selected from among alkoxy groups, carboxyl groups, amino groups, aminoxy groups, oxime groups, amido groups, imido groups, vinyloxy groups and lactam groups.
  • the substituted or unsubstituted monovalent hydrocarbon radicals can be bonded to a silicon atom in addition to the functional groups.
  • the cross-linking agent can also include catalysts which accelerate the condensation reaction between hydroxyl-group-containing polyorganosiloxane and silane or siloxane containing the abovementioned functional groups.
  • the catalyst can be metal salts of organic carboxylic acids, in which examples of carboxylic acids include acetic acid, octanoic acid, lauric acid, stearic acid, oleic acid, linolic acid, benzoic acid and naphthoic acid, and examples of metals include tin, lead, iron, antimony, zirconium, cadmium, barium, calcium, titanium, bismuth and manganese.
  • Other catalyst can be titanium compounds such as: ##EQU2## where each R 1 represents a substituted or unsubstituted monovalent hydrocarbon radical, R 2 represents a divalent organic group, n is an integer from 1 to 3, and m is an integer greater than or equal to 1. These titanium compounds include chelates of titanium.
  • the liquid polyorganosiloxane used in the addition reaction is a polyorganosiloxane having vinyl radicals bonded to silicon atoms either at the polymer ends or along the polymer chain.
  • the cross-linking agent for the addition reaction is an organohydrogensilane or a polyorganohydrogensiloxane and a catalyst for accelerating the addition reaction.
  • the organohydrogensilane or polyorganohydrogensiloxane can be represented by the average unit formula ##EQU3## where R is defined above, b is 0 ⁇ b ⁇ 3, c is 0 ⁇ c ⁇ 2, and the sum of b+c is 0 ⁇ b+c ⁇ 4.
  • a cyclic or linear polyorganohydrogensiloxane having at least two SiH groups per molecule is particularly preferred.
  • the catalyst can be a metal or compound of platinum, rhodium or palladium.
  • platinum or platinum compounds are preferred. Examples include platinum adhering to a support, chloroplatinic acid hexahydrate, alcohol-modified chloroplatinate, complexes of platinum and olefins, complexes of platinum and ketones and complexes of platinum and vinylsiloxanes.
  • Carbon black, component (B) used in this invention is different in various ways from the conventional carbon blacks such as acetylene black, furnace black, thermal black and channel black. Its most remarkable characteristics are the fact that the specific surface area is at least 900 m 2 /g and that the particles are hollow-shell-shaped particles.
  • the characteristics of the conventional carbon black are as follows: specific surface area, 50-500 m 2 /g; oil absorption, 80-130 ml/100 g; pH, 3-11; average particle size, 15-500 m ⁇ ; while the characteristics of the carbon black used in this invention are as follows: specific surface area, 900-1100 m 2 /g (average, 1000 m 2 /g); oil absorption, 300-400 ml/100 g (average, 340 ml/100 g); pH, 9.5; average particle size 30 m ⁇ .
  • the carbon black used in this invention is inferior in terms of dispersibility compared to the conventional carbon black, it has excellent electrical conductivity.
  • a commercial product of this type of carbon black is Ketjenblack EC (Lion Akuzo K.K.).
  • the commercial product can be used without any treatment, or a product which is partially graphitized by baking at 1500°-2000° C. or one which is totally graphitized can be also used.
  • the amount to be used depends upon the desired degree of electrical conductivity. However, it generally ranges from 0.1 to 70 parts by weight to 100 parts by weight of organopolysiloxane as component (A) and preferably from 1 to 40 parts by weight.
  • Component (C) used in this invention is a polydiorganosiloxane having hydroxyl groups at both ends of the molecule. This component is not always an indispensable component in the composition of this invention. However, since dispersibility of component (B) is poor, it is an effective component which can improve dispersibility, flowability and electrical conductivity as well. Such an effect cannot be obtained in the case of polydiorganosiloxane in which both molecular chain terminals are blocked with triorganosilyl groups.
  • This diorganopolysiloxane is expressed by the general formula ##STR1## where each R 3 and R 4 is the same as R defined above and can be the same or different, and preferably are methyl groups, vinyl groups, phenyl groups and groups including alkylene units, and 1 is an integer less than or equal to 50.
  • the amount of addition of component (C) ranges from 0 to 50 parts by weight to 100 parts by weight of organopolysiloxane as a component (A). If it exceeds 50 parts by weight, the physcial properties are affected.
  • composition of this invention can be prepared simply by mixing component (A) and component (B), or by mixing component (A), component (B) and component (C). If component (C) is used, component (B) can be wetted or dispersed with component (C) in advance and subsequently the mixture can be added to component (A). In addition to the above-mentioned components, other additives can be used if desirable.
  • additives are electrically conductive materials such as other types of carbon black, graphite, carbon fiber, metal wire and metal particles; fillers such as fumed silica, precipitated silica, quartz powder, diaatomaceous earth, calcium carbonate and sintered clay, metal oxides such as titanium oxide, iron oxide and zinc oxide; curing retarders, plasticizers; heat resistance agents; flame retardants; organic solvents and other additives.
  • compositions of this invention can be used for connectors of keyboards of electric calculators, cores of ignition cable and gaskets for microwave ovens.
  • Polydimethylsiloxane 100 parts consisting of 97 mol% of dimethylsiloxane units blocked at both ends with trimethylsilyl groups and 3 mol% of methylvinylsiloxane units (viscosity: 0.0007 m 2 /s) was homogeneously blended with Ketjenblack EC (Lion Akuzo K.K.) (15 parts) and dicumyl peroxide (3 parts). This mixture was used in Experiment No. 1. Similarly, polydimethylsiloxane having hydroxyl groups on both ends of the molecule with an average degree of polymerization of 10 (5 parts) was added to the above mixture and the mixture was used in Experiment No. 2.
  • Denka Black (Denki Kagaku Kogyo K.K.) (20 parts) was used in the mixture instead of Keychain Black EC as in Experiment No. 1 and the mixture was used in Experiment No. 3.
  • Denka Black is an acetylene black, has high structure, does not have hollow-shell-shaped particles, has a specific surface area of 61 m 2 /g, an oil absorption of 115 cubic centimeters per 100 grams, a pH of 6.5 and an average particle size of 42 millimicrons. The viscosity of each composition was measured. Thereafter, the composition was placed in a mold and cured under a pressure of 20 kg/cm 2 at a temperature of 160° C. for 10 minutes.
  • Polydimethylsiloxane (100 parts) having terminal hydroxyl groups with a viscosity of 0.0002 m 2 /s was mixed by stirring with an alkoxysilane (5 parts) as shown in Table II, Ketjenblack EC (Lion Akuzo K.K.) (10 parts) and dibutyltin dilaurate (0.5 parts).
  • the composition was poured into a mold and cured by leaving the mold at room temperature overnight, as Experiment No. 4.
  • 0.5 part of dibutyltin dilaurate was used and an aminoxysilane was used as a cross-linking agent instead of alkoxysilane, as Experiment No. 5.
  • Polydimethylsiloxane 100 parts having dimethylvinylsilyl groups on both ends of the molecule with a viscosity of 0.002 m 2 /s was mixed with polymethylhydrogensiloxane (3 parts) having trimethylsilyl groups on both ends of the molecule with a viscosity of 0.00001 m 2 /s and Ketjenblack EC (Lion Akuzo K.K.) in three different amounts as shown in Table III.
  • a solution of chloroplatinic acid hexahydrate in ethanol was used as a catalyst in an amount of 15 ppm as platinum based on the total amount of the above-mentioned polysiloxane.
  • Vulcan XC-72 (Cabot Corp.) was added instead of the Ketjenblack EC in Experiment 10, and the mixture was cured for Experiment No. 12.
  • Vulcan XC-72 has a specific area of 254 m 2 /g, an oil absorption of 185 cubic centimeters per 100 grams, a pH of 7.2 and an average particle size of 30 millimicrons.
  • Tests for heat resistance and flame retardancy were conducted on the following four specimens: Experiment No. 1 in Example 1, Experiment No. 4 in Example 2, and Experiments Nos. 10 and 12 in Example 3. The most excellent results were obtained in the case of Experiment No. 10 using an addition reaction type liquid organopolysiloxane. The results are presented in Table IV.
  • the flame retardancy was measured as follows. A test specimen with a length of 130 mm, a width of 13 mm and a thickness of 2 mm was prepared and fixed in still air. The flame of a Bunsen burner was applied for 15 seconds for ignition in such a position that the lower end of the experimental specimen was brought into contact with the upper section of the inner flame of the Bunsen burner. Subsequently, the Bunsen burner was taken away and the time required for the flame to extinguish (seconds) was measured. This test was repeated twice for five test specimens. The average value of each test series was expressed as flame retardancy.
  • Polydimethylsiloxane copolymer (70 parts) having terminal methylphenylvinylsilyl groups on both ends which consisted of 90 mol% of dimethylsiloxane units and 10 mol% of methylphenylsiloxane units (viscosity of 0.01 m 2 /s) was mixed with a copolymer (30 parts) consisting of SiO 2 units, CH 3 SiO 0 .5 units and (CH 3 ) 2 (CH 2 ⁇ CH)SiO 0 .5 units (vinyl group content of 3 mol%).
  • Polymethylhydrogensiloxane (4 parts) having terminal trimethylsilyl groups on both ends as in Example 3 and Ketjenblack EC (Lion Akuzo K.K.) (15 parts) were mixed with the above mixture.
  • a solution of chloroplatinic acid hexahydrate in isopropyl alcohol was added in an amount of 20 ppm as platinum based on the above-mentioned polysiloxane.
  • the mixture was poured into a mold and cured in an oven at 150° C. for 30 minutes as Experiment No. 13.
  • Polymethylphenylsiloxane (10 parts) having terminal hydroxyl groups on both ends with a degree of polymerization of 30 was added to the composition as in Experiment No.

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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US06/122,782 1979-03-09 1980-02-19 Electrically conductive curable liquid organopolysiloxane compositions Expired - Lifetime US4273697A (en)

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JP2676079A JPS55120656A (en) 1979-03-09 1979-03-09 Curable liquid organopolysiloxane composition
JP54-26760 1979-03-09

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AU (1) AU531368B2 (en, 2012)
BE (1) BE882126A (en, 2012)
BR (1) BR8001389A (en, 2012)
CA (1) CA1138187A (en, 2012)
DE (1) DE3008083A1 (en, 2012)
FR (1) FR2450856B1 (en, 2012)
GB (1) GB2045790B (en, 2012)
IT (1) IT1130927B (en, 2012)
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US20100209687A1 (en) * 2007-10-12 2010-08-19 Bizhong Zhu Reinforced Silicone Resin Film and Nanofiber-Filled Silicone Composition
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JPS6140327A (ja) * 1984-07-31 1986-02-26 Toray Silicone Co Ltd 液状シリコ−ンゴムベ−スの製造方法
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JPS55120656A (en) 1980-09-17
SE8001819L (sv) 1980-09-10
GB2045790B (en) 1983-02-23
NL8001382A (nl) 1980-09-11
JPS6254825B2 (en, 2012) 1987-11-17
DE3008083A1 (de) 1980-09-18
BE882126A (fr) 1980-09-08
FR2450856A1 (fr) 1980-10-03
FR2450856B1 (fr) 1986-01-31
GB2045790A (en) 1980-11-05
CA1138187A (en) 1982-12-28
BR8001389A (pt) 1980-11-11
AU531368B2 (en) 1983-08-18
IT1130927B (it) 1986-06-18
AU5624780A (en) 1980-09-11
IT8020435A0 (it) 1980-03-07

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